Cryogenic air separation process producing elevated pressure...

Details Cryogenic air separation process producing elevated pressure... Cryogenic air separation process producing elevated pressure...

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/04 (2006.01)

Patent

CA 2131656

The process of the present invention is a cryogenic air separation process with three important features: (1) at least a portion of a nitrogen-rich liquid from the column system is boosted in pressure before being vaporized and delivered as a product; (2) at least a portion of the feed air is at least partially condensed in indirect heat exchange with the boosted pressure, nitrogen-rich stream; and (3) a portion of the liquid nitrogen condensed from the vapor nitrogen from the top of the higher pressure column is returned to the higher pressure column as reflux with the remaining portion being removed from the column system.

Le procédé de la présente invention est un procédé cryogénique de séparation de l'air, qui offre trois caractéristiques importantes : (1) au moins une partie d'un liquide riche en azote extrait du système de colonnes de distillation est comprimé avant d'être vaporisé et livré en tant que produit; (2) au moins une partie de l'air gazeux d'alimentation est au moins partiellement condensé dans un échange thermique indirect avec le liquide riche en azote comprimé; et (3) une partie de l'azote liquide comprimé produit à partir de l'azote gazeux extrait du haut de la colonne moyenne pression est envoyé en reflux de la colonne moyenne pression, l'autre partie étant prélevée.

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